IMO the damage internationally is permanent unless constitutional changes are made to prevent such events in the future. The trust is completely gone.
The risk of making any deals that could be overturned in just four years is too great for many in the private sector and also for international treaties.
This is the key.
Germany founded the Federal Constitutional Court of Germany (Bundesverfassungsgericht) to make sure they don't go Fascist again.
The US needs a similar structure with similar protections (term limits, mandatory retirement age, 2/3 majority needed for nominations and shared power of naming the members).
And it's explicitly a court for constitutional matters, not random cases.